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  /* 基础样式 */
  .book {
    margin: 10px;
    padding: 15px;
    border: 1px solid #ccc;
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  [data-category="科幻"]{
    background-color: #007bff;
    color: white;
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  [data-category="历史"]{
    background-color: #8b4513;
    color: #fffdd0;
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  [title^="入门"] h2::before {
    content: "🌟";
    margin-right: 5px;
    font-size: 1.2em;
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<body>
  <div class="book" data-category="科幻">
    <h2>三体</h2>
    <p>作者：刘慈欣</p>
  </div>
  <div class="book" data-category="历史">
    <h2>明朝那些事</h2>
    <p>作者：当年明月</p>
  </div>
  <div class="book" data-category="小说">
    <h2>活着</h2>
    <p>作者：余华</p>
  </div>
  <div class="book" data-type="语言学习" title="入门日语初级课程">
    <h2>日语初级课程</h2>
    <p>学习日常对话和基本语法</p>
  </div>
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